HH may refer to:

Organizations

Happy Hippie Foundation The Happy Hippie Foundation is an American non-profit organization founded by entertainer Miley Cyrus on September 17, 2014, and officially launched to the public on May 5, 2015. The foundation focuses on youth homelessness (particularly among L ...

, a non-profit organization founded by Miley Cyrus *

Hartmann House Preparatory School Hartmann House Preparatory School (or Hartmann House, also referred to as HH) is an independent, preparatory, day school for boys in Harare, Zimbabwe. The school was founded in 1957 and named after Fr Hartmann SJ, a chaplain to the Pioneer Colu ...

, an independent preparatory school in Harare, Zimbabwe *

Heirs Holdings Heirs Holdings is a family-owned investment holding company headquartered in Lagos, Nigeria with investment interests in various sectors in Africa. History Heirs Holdings was founded in 2010 by Tony O. Elumelu, CON after his retirement in 2010 ...

, a Nigerian conglomerate with diversified interests *

Helly Hansen Helly Hansen (HH) is a Norwegian manufacturer and retailer of clothing and sports equipment and a subsidiary of the Canadian retail chain Canadian Tire. Currently headquartered in Oslo, it was previously headquartered in Moss, Norway from its fou ...

, a Norwegian brand specializing in clothing and gear for oceans and mountains *

Heywood Hill Heywood Hill is a bookshop at 10 Curzon Street in the Mayfair district of London. History The shop was opened by George Heywood Hill on 3 August 1936, with the help of Lady Anne Gathorne-Hardy, who would later become his wife. For the last ...

, a bookshop in London

Science and technology

* Hh, a signalling molecule in Drosophila named for the

Hedgehog signaling pathway The Hedgehog signaling pathway is a signaling pathway that transmits information to embryonic cells required for proper cell differentiation. Different parts of the embryo have different concentrations of hedgehog signaling proteins. The pathwa ...

* hh blood group, a rare blood type *

Henderson–Hasselbalch equation In chemistry and biochemistry, the Henderson–Hasselbalch equation :\ce = \ceK_\ce + \log_ \left( \frac \right) relates the pH of a chemical solution of a weak acid to the numerical value of the acid dissociation constant, ''K''a, of acid and th ...

, in biology and chemistry *

Herbig–Haro object Herbig–Haro (HH) objects are bright patches of nebulosity associated with newborn stars. They are formed when narrow jets of partially ionised gas ejected by stars collide with nearby clouds of gas and dust at several hundred kilometres per s ...

, in astronomy *

Hitchhiker Program The Hitchhiker Program (HH) was a NASA program established in 1984 and administered by the Goddard Space Flight Center (GSFC) and the Marshall Space Flight Center (MSFC). The program was designed to allow low-cost and quick reactive experiments t ...

, a NASA program established in 1984 *

Hodgkin–Huxley model The Hodgkin–Huxley model, or conductance-based model, is a mathematical model that describes how action potentials in neurons are initiated and propagated. It is a set of nonlinear differential equations that approximates the electrical chara ...

, an electrical model of neurons *

Microsoft Compiled HTML Help Microsoft Compiled HTML Help is a Microsoft proprietary online help format, consisting of a collection of HTML pages, an index and other navigation tools. The files are compressed and deployed in a binary format with the extension .CHM, for Com ...

(hh.exe) *

Hereditary haemochromatosis Hereditary haemochromatosis type 1 (HFE-related Hemochromatosis) is a genetic disorder characterized by excessive intestinal absorption of dietary iron, resulting in a pathological increase in total body iron stores. Humans, like most animals, h ...

Transportation

HH (Court Street Shuttle) HH was the last of the letters assigned to original routes of the Independent Subway System of the New York City Subway in the 1930s. It was designated as the dedicated service letter of the IND Fulton Street Line in Brooklyn. The letter was in ...

a defunct line on the New York City Subway from 1936 to 1946 *

HH (Rockaway Shuttle) The Rockaway Park Shuttle is a New York City Subway shuttle train that operates in Queens. It connects with the train at Broad Channel station and is the latest iteration of the Rockaway Shuttle services that have been running on the Rockaway ...

, from 1962 to 1972 *

HH Ferry route HH may refer to: Organizations * Happy Hippie Foundation, a non-profit organization founded by Miley Cyrus * Hartmann House Preparatory School, an independent preparatory school in Harare, Zimbabwe * Heirs Holdings, a Nigerian conglomerate with ...

between Helsingborg, Sweden and Helsingør, Denmark *

Air Hamburg Air Hamburg Luftverkehrsgesellschaft mbH (also known as AIR HAMBURG) is an open-base charter airline headquartered in Hamburg, Germany. According to its own statement, it is the "largest provider of charter business aviation in Europe". In 200 ...

, a German airline based in Hamburg (IATA code HH)

Other uses

hh (digraph) This is a list of digraphs used in various Latin alphabets. Capitalisation involves only the first letter (''ch'' becomes ''Ch'') unless otherwise stated (''ij'' becomes ''IJ''). Letters with diacritics are arranged in alphabetic order accordin ...

, in several languages * HH, a

brassiere cup size Bra size (also known as brassiere measurement or bust size) indicates the size characteristics of a bra. While there are a number of bra sizing systems in use around the world, the bra sizes usually consist of a number, indicating the size of the ...

* hh, an abbreviation for " hands high" when referring to the height of a horse * HH, short for Hand-Held, a term in film production among camera staff *HH, the production code for the 1967 ''Doctor Who'' serial ''

The Moonbase ''The Moonbase'' is the half-missing sixth serial of the fourth season in the British science fiction television series ''Doctor Who'', which was first broadcast in four weekly parts from 11 February to 4 March 1967. In this serial, the Secon ...

'' *

Hakainde Hichilema Hakainde Hichilema (born 4 June 1962) is a Zambian businessman, farmer, and politician who is the seventh and current president of Zambia since 24 August 2021. After having contested five previous elections in 2006, 2008, 2011, 2015 and 20 ...

, Zambian politician *

Hamburg (male), (female) en, Hamburger(s), Hamburgian(s) , timezone1 = Central (CET) , utc_offset1 = +1 , timezone1_DST = Central (CEST) , utc_offset1_DST = +2 , postal ...

, Germany (ISO 3166-2 code DE-HH) and HH ("Hansestadt Hamburg"), vehicle licence plate prefix * Happy Hour, a period of time (not necessarily one hour) when bars and restaurants offer discounts on food and/or drinks *

Heil Hitler The Nazi salute, also known as the Hitler salute (german: link=no, Hitlergruß, , Hitler greeting, ; also called by the Nazi Party , 'German greeting', ), or the ''Sieg Heil'' salute, is a gesture that was used as a greeting in Nazi Germany. T ...

, a chant prevalent in Nazi Germany and neo-Nazi groups * His Highness, or Her Highness, a formal address * His Holiness, or Her Holiness, a formal address *

Horrible Histories ''Horrible Histories'' is an educational entertainment franchise encompassing many media including books, magazines, audio books, stage shows, TV shows, and more. In 2013, Lisa Edwards, UK publishing and commercial director of Scholastic Corpor ...

, media franchise * Hulk Hogan, American professional wrestler *

Herbert Huncke Herbert Edwin Huncke (January 9, 1915 – August 8, 1996) was an American writer and poet, and an active participant in a number of emerging cultural, social and aesthetic movements of the 20th century in America. He was a member of the Beat ...

, American Writer {{disambiguation